Question 1

Which type of wave motion does not involve photons?

Accepted Answer

A) gamma rays 
B) microwaves 
C) radio waves 
D) infrared radiation 
E) sound waves 
A) gamma rays 
B) microwaves 
C) radio waves 
D) infrared radiation 
E) sound waves E

Question 2

A laser emits a 5.0 × 103-J pulse of light that has a wavelength of 480 nm.Determine the number of photons in the pulse.

Accepted Answer

A) 5.2 × 1016 
B) 2.5 × 1019 
C) 1.2 × 1022 
D) 3.1 × 1022 
E) 8.1 × 1024 
A) 5.2 × 1016 
B) 2.5 × 1019 
C) 1.2 × 1022 
D) 3.1 × 1022 
E) 8.1 × 1024 C

Question 3

Complete the following statement: The photon description of light is necessary to explain

Accepted Answer

A) polarization 
B) photoelectric effect 
C) diffraction of light 
D) electron diffraction 
E) interference of light 
A) polarization 
B) photoelectric effect 
C) diffraction of light 
D) electron diffraction 
E) interference of light B

Question 4

The graph shows the variation in radiation intensity per unit wavelength versus wavelength for a perfect blackbody at temperature T.   Complete the following statement: As the blackbody temperature is increased, the peak in intensity of this curve

Accepted Answer

A) will remain constant. 
B) will be shifted to longer wavelengths and its magnitude will increase. 
C) will be shifted to shorter wavelengths and its magnitude will increase. 
D) will be shifted to longer wavelengths and its magnitude will decrease. 
E) will be shifted to shorter wavelengths and its magnitude will decrease. 
A) will remain constant. 
B) will be shifted to longer wavelengths and its magnitude will increase. 
C) will be shifted to shorter wavelengths and its magnitude will increase. 
D) will be shifted to longer wavelengths and its magnitude will decrease. 
E) will be shifted to shorter wavelengths and its magnitude will decrease.

Question 5

Upon which one of the following parameters does the energy of a photon depend?

Accepted Answer

A) mass 
B) amplitude 
C) polarization 
D) frequency 
E) phase relationships 
A) mass 
B) amplitude 
C) polarization 
D) frequency 
E) phase relationships

Question 6

In a computer monitor, electrons approach the screen at 1.20 × 108 m/s.What is the de Broglie wavelength of these electrons? Note: the mass of electrons is 9.109 × 10-31 kg; and use the relativistic momentum in your calculation.

Accepted Answer

A) 4.31 × 10-12 m 
B) 5.56 × 10-12 m 
C) 6.07 × 10-12 m 
D) 6.62 × 10-12 m 
E) 7.85 × 10-12 m 
A) 4.31 × 10-12 m 
B) 5.56 × 10-12 m 
C) 6.07 × 10-12 m 
D) 6.62 × 10-12 m 
E) 7.85 × 10-12 m

Question 7

The speed of a bullet with a mass of 0.050 kg is 420 m/s with an uncertainty of 0.010 %.What is the minimum uncertainty in the bullet's position if it is measured at the same time as the speed is measured?

Accepted Answer

A) 2.5 × 10-31 m 
B) 5.0 × 10-32 m 
C) 7.5 × 10-33 m 
D) 2.5 × 10-34 m 
E) 6.0 × 10-36 m 
A) 2.5 × 10-31 m 
B) 5.0 × 10-32 m 
C) 7.5 × 10-33 m 
D) 2.5 × 10-34 m 
E) 6.0 × 10-36 m

Question 8

29-2
It is desired to obtain a diffraction pattern for electrons using a diffraction grating with lines separated by 10 nm.The mass of an electron is 9.11 × 10S1U1P1-S1S1P0S1U1P131S1S1P0 kg.
-Suppose it is desired to observe diffraction effects for a beam of electromagnetic radiation using the same grating.Roughly, what is the required energy of the individual photons in the beam?

Accepted Answer

A) 10-6 eV 
B) 10-4 eV 
C) 10-2 eV 
D) 102  eV 
E) 104 eV 
A) 10-6 eV 
B) 10-4 eV 
C) 10-2 eV 
D) 102  eV 
E) 104 eV

Question 9

What is the de Broglie wavelength of an electron (m = 9.11 × 10-31 kg) in a 2.5 × 103-volt X-ray tube?

Accepted Answer

A) 0.0072 nm 
B) 0.011 nm 
C) 0.017 nm 
D) 0.031 nm 
E) 0.025 nm 
A) 0.0072 nm 
B) 0.011 nm 
C) 0.017 nm 
D) 0.031 nm 
E) 0.025 nm

Question 10

Determine the de Broglie wavelength of a neutron (m = 1.67 × 10-27 kg) that has a speed of 5.0 m/s.

Accepted Answer

A) 79 nm 
B) 162 nm 
C) 395 nm 
D) 529 nm 
E) 1980 nm 
A) 79 nm 
B) 162 nm 
C) 395 nm 
D) 529 nm 
E) 1980 nm

Question 11

Photons of energy 5.0 eV strike a metal surface that has a work function of 3.5 eV.Determine which one of the following best describes the kinetic energy of the emitted electrons.

Accepted Answer

A) 1.5 eV or less 
B) 1.5 eV or more, but less than 2.5 eV 
C) 2.5 eV or more, but less than 3.5 eV 
D) 3.5 eV or more 
E) 3.5 eV or less, but more than 1.5 eV 
A) 1.5 eV or less 
B) 1.5 eV or more, but less than 2.5 eV 
C) 2.5 eV or more, but less than 3.5 eV 
D) 3.5 eV or more 
E) 3.5 eV or less, but more than 1.5 eV

Question 12

A laser produces 3.0 W of light that has a wavelength of 600 nm.How many photons per second are produced?

Accepted Answer

A) 7.3 × 1015 
B) 4.2 × 1017 
C) 1.0 × 1017 
D) 3.0 × 1018 
E) 9.1 × 1018 
A) 7.3 × 1015 
B) 4.2 × 1017 
C) 1.0 × 1017 
D) 3.0 × 1018 
E) 9.1 × 1018

Question 13

Determine the energy of a single photon in a monochromatic beam of light of wavelength 625 nm.

Accepted Answer

A) 1.99 eV 
B) 2.08 eV 
C) 2.32 eV 
D) 3.49 eV 
E) 4.77 eV 
A) 1.99 eV 
B) 2.08 eV 
C) 2.32 eV 
D) 3.49 eV 
E) 4.77 eV

Question 14

White light consisting of wavelengths 380 nm $\le$$\lambda$ $\le$750 nm is incident on a lead surface.For which one of the following ranges of wavelengths will photoelectrons be emitted from the lead surface that has a work function W0 = 6.63 × 10-19 J?

Accepted Answer

A) 380 nm $\le$$\lambda$$\le$ 750 nm 
B) 380 nm $\le$ $\lambda$$\le$ 630 nm 
C) 380 nm $\le$ $\lambda$$\le$ 540 nm 
D) 380 nm $\le$ $\lambda$$\le$410 nm 
E) No photoelectrons will be emitted. 
A) 380 nm $\le$$\lambda$$\le$ 750 nm 
B) 380 nm $\le$ $\lambda$$\le$ 630 nm 
C) 380 nm $\le$ $\lambda$$\le$ 540 nm 
D) 380 nm $\le$ $\lambda$$\le$410 nm 
E) No photoelectrons will be emitted.

Question 15

In the Compton scattering experiment shown in the figure, a monochromatic beam of X-rays strikes a target containing free electrons.Scattered X-rays are detected with a wavelength of 2.50 × 10-12 m at an angle of 45° away from the original beam direction.What is the wavelength of the incident monochromatic X-rays? Note: The mass of an electron is 9.11 × 10-31 kg.

Accepted Answer

A) 3.21 × 10-12 m 
B) 2.86 × 10-12 m 
C) 2.50 × 10-12 m 
D) 2.03 × 10-12 m 
E) 1.79 × 10-12 m 
A) 3.21 × 10-12 m 
B) 2.86 × 10-12 m 
C) 2.50 × 10-12 m 
D) 2.03 × 10-12 m 
E) 1.79 × 10-12 m

Question 16

Which one of the following statements concerning photons is false?

Accepted Answer

A) Photons have zero mass. 
B) The rest energy of all photons is zero. 
C) Photons travel at the speed of light in a vacuum. 
D) Photons have been brought to rest by applying a very strong magnetic field to them. 
E) The energy of a photon is proportional to its frequency. 
A) Photons have zero mass. 
B) The rest energy of all photons is zero. 
C) Photons travel at the speed of light in a vacuum. 
D) Photons have been brought to rest by applying a very strong magnetic field to them. 
E) The energy of a photon is proportional to its frequency.

Question 17

Approximately, what is the de Broglie wavelength of an electron that has been accelerated through a potential difference of 225 V? The mass of an electron is 9.11 × 10-31 kg.

Accepted Answer

A) 0.14 nm 
B) 0.082 nm 
C) 0.043 nm 
D) 0.0092 nm 
E) 0.22 nm 
A) 0.14 nm 
B) 0.082 nm 
C) 0.043 nm 
D) 0.0092 nm 
E) 0.22 nm

Question 18

A photon has a collision with a stationary electron (h/mc = 2.43 × 10-12 m) and loses 5.0% of its energy.The photon scattering angle is 180°.What is the wavelength of the incident photon in this scattering process?

Accepted Answer

A) 2.4 × 10-12 m 
B) 4.6 × 10-11 m 
C) 9.2 × 10-11 m 
D) 1.9 × 10-10 m 
E) 3.1 × 10-12 m 
A) 2.4 × 10-12 m 
B) 4.6 × 10-11 m 
C) 9.2 × 10-11 m 
D) 1.9 × 10-10 m 
E) 3.1 × 10-12 m

Question 19

Which one of the following is demonstrated by the Compton effect?

Accepted Answer

A) time dilation 
B) length contraction 
C) the uncertainty principle 
D) the wave properties of electrons 
E) the particle properties of electromagnetic radiation 
A) time dilation 
B) length contraction 
C) the uncertainty principle 
D) the wave properties of electrons 
E) the particle properties of electromagnetic radiation

Question 20

What happens to the de Broglie wavelength of an electron if its momentum is reduced to one-half of its initial value?

Accepted Answer

A) The wavelength decreases by a factor of 4. 
B) The wavelength increases by a factor of 4. 
C) The wavelength increases by a factor of 3. 
D) The wavelength increases by a factor of 2. 
E) The wavelength decreases by a factor of 2. 
A) The wavelength decreases by a factor of 4. 
B) The wavelength increases by a factor of 4. 
C) The wavelength increases by a factor of 3. 
D) The wavelength increases by a factor of 2. 
E) The wavelength decreases by a factor of 2.

Exam 29: Particles and Waves

Which type of wave motion does not involve photons?

A laser emits a 5.0 × 103-J pulse of light that has a wavelength of 480 nm.Determine the number of photons in the pulse.

Complete the following statement: The photon description of light is necessary to explain

The graph shows the variation in radiation intensity per unit wavelength versus wavelength for a perfect blackbody at temperature T. Complete the following statement: As the blackbody temperature is increased, the peak in intensity of this curve

Upon which one of the following parameters does the energy of a photon depend?

In a computer monitor, electrons approach the screen at 1.20 × 108 m/s.What is the de Broglie wavelength of these electrons? Note: the mass of electrons is 9.109 × 10-31 kg; and use the relativistic momentum in your calculation.

The speed of a bullet with a mass of 0.050 kg is 420 m/s with an uncertainty of 0.010 %.What is the minimum uncertainty in the bullet's position if it is measured at the same time as the speed is measured?

What is the de Broglie wavelength of an electron (m = 9.11 × 10-31 kg) in a 2.5 × 103-volt X-ray tube?

Determine the de Broglie wavelength of a neutron (m = 1.67 × 10-27 kg) that has a speed of 5.0 m/s.

Photons of energy 5.0 eV strike a metal surface that has a work function of 3.5 eV.Determine which one of the following best describes the kinetic energy of the emitted electrons.

A laser produces 3.0 W of light that has a wavelength of 600 nm.How many photons per second are produced?

Determine the energy of a single photon in a monochromatic beam of light of wavelength 625 nm.

White light consisting of wavelengths 380 nm ≤\le≤λ\lambdaλ ≤\le≤ 750 nm is incident on a lead surface.For which one of the following ranges of wavelengths will photoelectrons be emitted from the lead surface that has a work function W0 = 6.63 × 10-19 J?

Which one of the following statements concerning photons is false?

Approximately, what is the de Broglie wavelength of an electron that has been accelerated through a potential difference of 225 V? The mass of an electron is 9.11 × 10-31 kg.

A photon has a collision with a stationary electron (h/mc = 2.43 × 10-12 m) and loses 5.0% of its energy.The photon scattering angle is 180°.What is the wavelength of the incident photon in this scattering process?

Which one of the following is demonstrated by the Compton effect?

What happens to the de Broglie wavelength of an electron if its momentum is reduced to one-half of its initial value?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Impulse and Momentum

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Reflection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

A laser emits a 5.0 × 10³-J pulse of light that has a wavelength of 480 nm.Determine the number of photons in the pulse.

In a computer monitor, electrons approach the screen at 1.20 × 10⁸ m/s.What is the de Broglie wavelength of these electrons? Note: the mass of electrons is 9.109 × 10^-³¹ kg; and use the relativistic momentum in your calculation.

What is the de Broglie wavelength of an electron (m = 9.11 × 10^-³¹ kg) in a 2.5 × 10³-volt X-ray tube?

Determine the de Broglie wavelength of a neutron (m = 1.67 × 10^-²⁷ kg) that has a speed of 5.0 m/s.

White light consisting of wavelengths 380 nm $\le$ $\lambda$ $\le$ 750 nm is incident on a lead surface.For which one of the following ranges of wavelengths will photoelectrons be emitted from the lead surface that has a work function W₀ = 6.63 × 10^-¹⁹ J?

Approximately, what is the de Broglie wavelength of an electron that has been accelerated through a potential difference of 225 V? The mass of an electron is 9.11 × 10^-³¹ kg.

A photon has a collision with a stationary electron (h/mc = 2.43 × 10^-¹² m) and loses 5.0% of its energy.The photon scattering angle is 180°.What is the wavelength of the incident photon in this scattering process?